The best example are roads.
USA economy is a mixed-market economy. It blends elements from market economy with elements from planned economies.
Private ownership is prioritized ( free market economy) but the government <em>has control over some public services</em> such as healthcare (to an extend), physical infrastructure<em> (the road system</em>), education, national defense, the postal system and some public lands.
The idea behind public ownership of these services is that they are better performed by public than private enterprise.
The roads in the USA and their infrastructure are<em> funded by taxes</em> (especially the gas one), tolls and user fees.
An important duty of the president is "negotiating treaties," since this duty falls to the executive branch, and the president is in charge of this branch (although this specific task is often delegated to the State Department).
I'm gonna do some more research then i'll get back to you on this.
Congress passed the War Powers Resolution<span> in the aftermath of the </span>Vietnam War<span> to solve concerns and create procedures for the US </span><span>to stick to during situations where they could cause conflict abroad upon entering.
Hope I could help.</span>
