1. what is the difference between a treaty and an executive agreement? !

The difference in between treaty and executive agreement is whether the President has the authority to execute it without the advice and consent of the Senate. If he/she has such authority, it is an executive agreement, and if not, it is a treaty

whose power in the senate is equal to the power of the speaker of the house?

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so.