"A split in the Democratic Party" was one reason among the choices given in the question that transformed U.S. politics in the 1920s. . I hope that this is the answer that has come to help
<em>The south gained by the strengthening of the fugitive slave law, the north gained a new free state, California. Texas lost territory but was compensated with 10 million dollars to pay for its debt. Slave trade was prohibited in Washington DC, but slavery was not.</em>
a. roman catholics
Roman catholicism is the most abundant religion in the area, although the region also has sizable populations of Catholics and Muslims and notable shares of Lutherans in some countries. However Catholicism remains the most predominant religion in the west of Eastern Europe. The most representative cases of this are Austria, and Poland. While, in the Czech Republic is the only country surveyed in which a majority of older people say they are religiously unaffiliated,still , there is a tendency back to religion in some areas among eldery and other social groups. Slovenia, Slovakia,etc also have considerable amounts of catholic devotes.
It brought tension and strife between USSR And US resulting in a Cold War