Do states have different governments? Does government bind states together? If so, how?

All State governments are modeled after the Federal Government and consist of three branches: executive, legislative, and judicial. The U.S. Constitution mandates that all States uphold a “republican form” of government, although the three-branch structure is not required. The federal system grants states large autonomy over lawmaking within their borders, so long as they do not violate citizens' rights or contradict federal laws. ... This system allows local state governments to be responsive to the particular needs of their citizens while binding the states together into a larger nation.

hope it helps.

a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.

the south did not want the federal laws to overrule the state laws.