How many states must ratify a proposed amendment in order for it to be added to the constitution?

After being officially proposed, either by Congress or a national convention of the states, a constitutional amendment must then be ratified by three-fourths of the states.

Explanation:

woodrow wilsons and the treaty signed between france britain and italy

i hope this

explanation:

max weber's 3 types of authority. the sociologist and philosopher  max weber  distinguishes  three types of authority—charismatic,  traditional  and legal-rational—each of which corresponds to a brand of  leadership that is operative in contemporary society.