Congress has recently gained power over the executive branch

Yes they have and now they can,

1) Make laws.

2) Declare war.

3) Raise and provide public money and oversee its proper expenditure.

4) Impeach and try federal officers.

5) Approve presidential appointments.

6) Approve treaties negotiated by the executive branch.

7) Oversight and investigations.

Explanation:

Don't know what the Q was but this is something:-\

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

a historian is attempting to study how the puritans affected society in new england