In this poll the japanese didnt atack pearl harbor and did not go to war.
But they are still involved in the Second Sino-Japanese War (1937-1945). And Japan has already captured French Indochina (22-26 September, 1940). Are the United States of this timeline still cutting oil, iron, and steel exports to Japan by July, 1940? Are there still lingering tensions between the two powers.
1, the nazis wouldnt have there factories being bombed, and would be able to keep the german war machine rolling.
How do you figure? The Royal Air Force (RAF) already bombed Mannheim on 16 December, 1940. The first deliberate "terror raid" by the British, since they were targeting civilian populations and were counting on their reaction against the German government.
Pet the British strategic dogma: "The ultimate aim of an attack on a town area is to break the morale of the population which occupies it. To ensure this, we must achieve two things: first, we must make the town physically uninhabitable and, secondly, we must make the people conscious of constant personal danger. The immediate aim, is therefore, twofold, namely, to produce (i) destruction and (ii) fear of death."
By March, 1942, the RAF had already taken the offensive. Their campaign starting with a bombing of Lübeck. In May, 1942, they bombed Cologne. By comparison the United States Air Force didn't start large scale bombings of German targets until 1943. And always on a lesser capacity than the RAF.
Per the estimates of Richard Humble, the RAF dropped the following bombs on German ground.
*1939- 31 tons.
*1940- 13,033 tons.
*1941- 31,504 tons.
*1942- 45,561 tons.
*1943- 157,457 tons.
*1944- 525,518 tons.
*1945- 964,644 tons.
The USAAF dropped the following:
*1942- 1,561 tons.
*1943- 44,265 tons.
*1944- 389,119 tons.
*1945- 188,573 tons.
2, The soviets wouldnt have all the supplies, guns, tanks, ect. That they would have recieved from the usa, thus decreasing their ability to wage war.
Decreasing, not negating. "The Soviet Union had 25,664 or 25,481 armoured fighting vehicles on 1 June 1941, before it entered the war."
3. The british, although they may still be able to keep the nazis from invading, would no be able to take any major offensives to retake the mainland.
Probably true. But they were keeping the Axis forces preoccupied in other campaigns:
*North African Campaign (10 June, 1940-13 May, 1943)
*East African Campaign (10 June, 1940-27 November, 1941).
*Battle of the Mediterranean (10 June, 1940-2 May, 1945).
*Siege of Malta (11 June, 1940-20 November, 1942).
*Balkans Campaign (28 October, 1940-1 June, 1941).
*Syria–Lebanon Campaign (8 June-14 July, 1941).
*Anglo-Soviet invasion of Iran (25 August-17 September, 1941). Securing the oil fields for the Allies.
4. The nazis would have more time and supplies to develope and produce more sophisticated weapons, such as the atomic bomb, jet aircrafts, and missles.
True about the time. Not certain if more supplies were possible. Particularly oils. Germany largely depended on Romanian oil for most of the war ("supplying 75% of Germany's oil imports in 1941") and never really matched the Allies on that resource.
Its best change to increase its supplies is capturing the Baku Oil Fields. But this would depend on Case Blue (28 June-19 November, 1942) being largely successful. Which is a rather big "if". See:
http://en.wikipedia.org/wiki/Case_Blue