It says that it was Catholicism and Mormonism
Economic problems began to sap at the North’s effort for an
effective reconstruction. Even public support
for reconstruction starts to decline. At
this point, Southerners call for an end to the Reconstruction. Though support was now declining, Congress
was still able to enact the Civil Rights Act of 1875 as part of its efforts to implement
the terms of the 14th and 15th Amendments.
The Mexican-American War was in the period 1846-1848. The main causes of the Mexican-American War were mainfest destiny (Americans believed that thye have the right to expand westward and conquer territory despite the rights of the indigenous people already living on that land), westward expansion, economics, and slavery
The answer is
A. By leading settlers across the Appalachians.
Hope this helped :)