Off topic but the collapse in the Irish birth rate post famine and the incredibly low (for the era) French birthrates really stand out.
Mostly because of the large scale emigration rate from Ireland of child-bearing age women during this period. Ireland was one of the few countries where slightly more women emigrated. For ethnic groups immigrating to the US between 1900 and 1910, women constituted 52.1% of all Irish immigrants. Compare this with 35.1% rate for all groups. The largest number of these women listed their profession as domestic servants, and the vast majority were of childbearing age. The only other groups to approach this parity were Jews with 43.4% of their immigrants being women.
At the other end of the spectrum for European immigrants from Bulgarians, Serbs, Montenegrins where women were a mere 4.3% of immigrants. Next were Greeks with 4.9%, Dalmatians, Bosnians and Herzegovenians with 7.7% being women, and Romanians 9%. A low number of women indicated a high number of temporary migrants. Consequently ethnic groups with a more even sex ratio (and higher numbers of young children), the more likely they were to remain permanently in their host countries. As a result, the Jews and Irish did have the lowest rate of return amongst ethnic groups.
As for France they were a unique case where their birth rate was already as low as 25 per 1,000 in 1881. They were the earliest country to experience a demographic transition, early in the 19th century. In addition, France had a very low rate of emigration, relying instead of large numbers of seasonal workers from Italy, Poland and Spain by 1914.