Explain indigo revolts. pls give a appropriate answer

What would lead a historian to consider two events to have a relationship of correlation rather than causation

When president johnson vetoed a law that would extend the freedmen’s bureau, congress reacted by supporting the veto and closing the freedmen’s bureau. writing a new law to show support for the black codes. overriding the veto and expanding the agency’s powers. drafting a law to prevent african americans from voting.

Which british law required americans to house and feed british troops? sugar and molasses actstamp actnavigation actsquartering act