Before the mid-1970s, vice presidents usually found that their main job was waiting
Step-by-step explanation:
In the early times, there was no office for the vice president in the United States, as they started getting independence, there were new laws and rules for the constitution and thus making an office for the vice president and giving him only some powers to be executed.
But there were much more increase in the role of the president in later times and the vice president now is given all the powers of the president to be executed in case the president dismisses, dies or leaves the office due to any reason.