Passive/Active Voice

I think I fixed some passive voice and made them more active...

Before:
Imagine what the United States government could do for the people with the money that they spend on weapons.

After:
Imagine what the United States government can do for the people with money spent on weapons.

Before:
A long needed national health plan could be introduced.

After:
A long needed national health plan can be introduced.

Before:
...people in the country could benefit from the u.s.

After:
...people in the country benefit from the u.s.