The republican party, formed in 1854, initially brought together various existing political parties together over what piece of legislation?

The answer is "The Kansas-Nebraska Act".

Senator Stephen Douglas was the person who introduced a bill in January 1854. This separated the land situated in the west of Missouri into Kansas and Nebraska. After much deliberation the act was passed on 30 May 1854 by the Congress as The Kansas-Nebraska Act. It allowed the territories to decide if they would allow slavery in their territories or not.

the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.