what idea was espoused with the webster-hayne debates?

the idea of a strong federal government
the ability of the people to revolt against an unfair government
the theory that the states’ may vote against unfair laws
the role of the president in commanding the government

The theory that the states’ may vote against unfair laws.

Explanation:

One of the most important questions debated in the Webster-Hayne debates was the question of what the purpose of the Union was. Whig Senator Daniel Webster of Massachusetts believed that the Union had been created in order to promote the good of the whole. On the other hand, Democrat Senator Robert Y. Hayne of South Carolina believed that the sovereign and independent states created the Union with the sole purpose of promoting their own interests.

This conflict led to the question of what actions could the states take when dealing with unfair laws. It also created the theory that the states should have the right to vote against unfair laws.