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.

i think they would live in caves or natural tunnels

the decreasing neutrality of the u. s. in world war i

hope this : )