Question: I know that the answer to the question "Which immigrants came to Philadelphia first, Russian or Irish?" is in "These immigrants were largely responsible for the first general strike in North America in 1835, in which workers in the city won the ten-hour workday. The city was a destination for thousands of Irish immigrants fleeing the Great Famine in the 1840s; housing for them was developed south of South Street, and was later occupied by succeeding immigrants. They established a network of Catholic churches and schools, and dominated the Catholic clergy for decades. Anti-Irish, anti-Catholic Nativist riots had erupted in Philadelphia in 1844. In the latter half of the century, immigrants from Russia, Eastern Europe and Italy; and African Americans from the southern U.S. settled in the city. Between 1880 and 1930, the African-American population of Philadelphia increased from 31,699 to 219,559. Twentieth-century black newcomers were part of the Great Migration out of the rural South to northern and midwestern industrial cities.". Can you tell me what it is?
Answer: Irish

Question: I know that the answer to the question "What lasted for a span of four years?" is in "Democratic Party candidates were consistently elected to local office, increasing the city's ties to the South and its dominant party. In 1861, Mayor Fernando Wood called on the aldermen to declare independence from Albany and the United States after the South seceded, but his proposal was not acted on. Anger at new military conscription laws during the American Civil War (18611865), which spared wealthier men who could afford to pay a $300 (equivalent to $5,766 in 2016) commutation fee to hire a substitute, led to the Draft Riots of 1863, whose most visible participants were ethnic Irish working class. The situation deteriorated into attacks on New York's elite, followed by attacks on black New Yorkers and their property after fierce competition for a decade between Irish immigrants and blacks for work. Rioters burned the Colored Orphan Asylum to the ground, but more than 200 children escaped harm due to efforts of the New York City Police Department, which was mainly made up of Irish immigrants. According to historian James M. McPherson (2001), at least 120 people were killed. In all, eleven black men were lynched over five days, and the riots forced hundreds of blacks to flee the city for Williamsburg, Brooklyn, as well as New Jersey; the black population in Manhattan fell below 10,000 by 1865, which it had last been in 1820. The white working class had established dominance. Violence by longshoremen against black men was especially fierce in the docks area. It was one of the worst incidents of civil unrest in American history.". Can you tell me what it is?
Answer: the American Civil War

Question: I know that the answer to the question "Between 135 C.E. and 500 C.E. the Jewish population of Babylonia did what?" is in "By the 1st century, Babylonia, to which Jews migrated to after the Babylonian conquest as well as after the Bar Kokhba revolt in 135 CE, already held a speedily growing population of an estimated 1,000,000 Jews, which increased to an estimated 2 million between the years 200 CE 500 CE, both by natural growth and by immigration of more Jews from the Land of Israel, making up about 1/6 of the world Jewish population at that era. At times conversion has accounted for a part of Jewish population growth. Some have claimed that in the 1st century of the Christian era, for example, the population more than doubled, from four to 810 million within the confines of the Roman Empire, in good part as a result of a wave of conversion.". Can you tell me what it is?
Answer:
doubled