Retroactively that is included in the Holocaust by historians, but the Wannsee Conference which was ordered by Hitler after the US entered the war happened in 1942. The first steps toward the 'Final Solution' began in mid-1941 with the Einsatzgruppen and a study ordered by Goering in July that eventually led to the Wannsee Conference as the Madagascar Plan was being dumped as the 'solution to the Jewish question'. But until Hitler gave the final order in December, the Holocaust as we know it wasn't planned, the Einsatzgruppen were part of Generalplan Ost and the belief that Jews were the leaders of communism, so just as the Commissar Order was to kill the leadership of the Communist Party, the murder of Soviet Jews was to kill off what the Nazis thought were the pillars of Communism in the USSR, the Jewish communities. It wasn't the full on genocide of all the Jews in Europe yet, it was part of the war on Communism, but lead directly into the Holocaust as the US entered the war and Hitler considered that all Jews needed to go, not just Soviet Jews.
The Einsatzgruppen did not kill 95% of Lithuanians; they focused on Jews and other categories, such as communists and Roma. What's more, that phase of the Holocaust killed about a quarter of the victims, around 1.3 million Jews (2 million total); not all of this was in 1941, but it was at its most intense in 1941.
At the same time, the situation in the Polish ghettos was getting dire. Food supplies were running low, and the Jews could no longer afford to pay for shipments. This led Hitler et al to develop the Final Solution; they did not want to spend resources on feeding people in the ghettos. Belzec began construction in November of 1941, and Chelmno in October of 1941. Focusing on Wannsee as the turning point is wrong - the decision had already been made months before. It misses not only a large minority of the genocide, but also what led to the decision to embark on the rest of the genocide. It wasn't any turning point within the broader course of the war, but internal developments to the Holocaust as it went on in 1941.
Not at all. A large part of the Holocaust was extermination through labor. The Nazis used their labor programs, even to the point of wasting eliminating skilled and useful labor, to exterminate people. I mean look at the construction of Camp Dora in the V-2 program. The Holocaust of course was an evolutionary (or devolutionary) process that continued to become more and more extreme as the Nazis realized what they could get away with, but were also motivated by the war continuing to escalate and drag on to no hope of victory (not that in victory they would have done much to moderate unless it became necessary).
And yet a large majority of people arriving at Auschwitz by train were sent to the gas chambers immediately - to say nothing of Treblinka II, Belzec, Chelmno, and Sobibor, which did not have labor camp annexes and did not select anyone for labor with the exception of Sonderkommando. (Treblinka I was a labor camp, but the total number of people who were imprisoned there, per Wikipedia, was 40,000, compared with 800,000 killed in Treblinka II.)
Extermination through labor was a small fraction of the Holocaust. It gets overrated in Holocaust stories because those are written by survivors, who were definitionally not gassed, and quite often survived by being selected for slave labor rather than extermination. Compare the number of Holocaust stories about Auschwitz with the number about Treblinka; Auschwitz killed 1.1 million people to Treblinka's 800,000, give or take, but because Auschwitz was both an extermination camp and a labor camp, it produced far more survivors, and thus far more stories. Auschwitz is a household name, a byword for the Holocaust and the gas chambers. Treblinka isn't - people in Israel learn about it, but they still use Auschwitz as the byword, and travel to Auschwitz for history field trips. The relative lack of attention paid to people who were shot by Einsatzgruppen in 1941 comes from a similar reason - few to no survivors, and usually those survivors either traveled east and their stories are part of the general Soviet history of victory over the Nazis or traveled west and had a personal history similar to that of the Polish Jews who survived through 1942.
In 1942 the Germans didn't really expect that they could win outright, they were gearing up for the 'War of Continents' where victory was over the USSR and the absorption of its resources to then have a show down with the US and UK, which Hitler then considered the true heart of the 'Jewish International Conspiracy'. There was only a slow down in extermination via gas chambers because they ran out of people that were easily accessible to exterminate.
Even relative to numbers, there was a slowdown. In Lithuania, people who survived to 1942 were generally rounded up in ghettos and survived well into 1943 at least. In Poland, the people who were still left in the ghettos by early 1943 were spared, modulo uprisings, until the Soviet advance was close enough that the Nazis decided to close up shop. There's a big difference between saying that the Soviet advance accelerated the liquidation of certain ghettos as the Nazis were trying to cover up evidence of what had happened, and saying that it or the US entry into the war contributed to the Holocaust writ large.
Getting their hands on Jews in Hungary, Romania, France, etc. required diplomacy as technically they were sovereign states still. By the end of 1942 it was the Jews immediately in Nazis clutches that were pretty much all gone unless they were really useful.
So what you're saying is that except a small number of useful slaves, all Jews in directly Nazi-occupied areas were killed even before the tide had turned against Germany?
I highly doubt the Warsaw Ghetto inhabitants would have survived the war if they didn't rise up; they rose up during another cleaning out of people for the camps and considering what happened to Warsaw when the Poles rose up, what do you think would have become of the Ghetto during that???
https://www.ushmm.org/wlc/en/article.php?ModuleId=10005188
The Nazis were killing them anyway, the Uprising was the result of the Nazis coming to close the Ghetto and send the last remaining Jews in the city to concentration camps
A combination of extermination and labor. There's a recent controversy over this, and I'd link you to articles in Haaretz about the subject, but they're paywalled because @#$%. The revisionist approach (in the sense of general historical revisionism, not specifically Holocaust revisionism or Revisionist Zionism) argues two things. First, the uprising was limited in scope (only 16 Germans were killed), and involved a small portion of the people in the ghetto; its actual military achievements were nil. And second, it accelerated the destruction of the ghetto and the deportation of its inhabitants, through Nazi collective punishment.