In general terms, how did Justice John Marshall treat issues of federalism in his Supreme Court rulings?

Answer: Expanded power of national government in comparison with state government

Explanation:

Justice John Marshall was a chief justice who was responsible for introduction and implementation of Supreme Court functioning in federal government. He influenced and strengthen the powers of Supreme court.

John Marshall supported that Supreme court has the ability to annul the laws and regulation of state government and federal government if any dispute or issue is caused by them. Thus, he increased the powers of national government.