How are the powers of the legislative branch held in check

 by the President of the US, and by the Supreme Court

Explanation:

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.

the united states began searching for a way to reduce oil

-agarvated