Question

Review Article 1, Section 10 here.

Answer 1

Section 10 grants more power to the federal government. States are not allowed to enter into treaties, and they cannot make agreements with other states or countries without the consent of Congress. 

Answer 2

Article 1, Section 10 of the United States Constitution greatly favors the Federal government. 

Federalism is evident in this section because it limits the power of the states.

There are 3 things that the state cannot do under this section. These are:
1) Contracts Clause
a) states can't interfere with private contracts.
b) states can't issue its own paper money and coins to pay off its debts
c) states can't create ex post facto laws without the benefit of judicial hearing.

2) Import-Export Clause
a) states can't impose tariffs or import/export taxes from foreign goods without the US Congress approval.
b) revenues earned from approved tariffs or import/export taxes must be paid to the federal government.

3) Compact Clause
a) states can't maintain armies or navies during peace times without consent from the Congress.
b) states can't enter into alliances with foreign nations.