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.

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you didn't list the options. however, a few communist countries today are: the people's republic of china, north korea, and cuba.

hello most volcanoes are located at either divergent or convergent plate

this is where the plate motions aswell form magma