Westward expansion pushed which issue to the forefront of American
politics in the 1850s?

Westward expansion, particularly west of the Mississippi River, had profound effects on American politics.This expansion created a number of political crises that revolved around the expansion of slavery, dispossession of Native Americans, and federal landholdings in the West.

Explanation:

the recent bombing of the uss cole is one of many incidents of terrorism directed against the united states. more than 40 percent of the world’s terrorism is directed against u.s. targets.   pursue the alleged perpetrators through the criminal justice system, and still others would beef up intelligence capabilities. to deal with potential attacks involving weapons of mass destruction, some analysts advocate extending the reach of law enforcement agencies or spending more on domestic preparedness programs; others would encourage a policy of u.s. military restraint overseas to attempt to reduce the motivation for terrorist attacks on u.s. targets.

a.

congress passed laws allowing for free passage between states.