I would say the Internet. The Internet has helped to connect people digitally around the world. It provides quick sources of entertainment and information.
If we want to know what's airing at the nearest cinema we can just look it up. If we want letters to be sent quickly that can happen in a second.
Dwight Eisenhower's experience with Cold War containment was born directly from the Second World War, in the sense that his objectives seemed very clear. By the time Nixon came to office, it was less clear about how the US should deal with the USSR, and it showed in Nixon's policies.
Generally speaking, it would be tat "b. They have helped provide more money for social services and welfare programs," that is not a characteristic of modern global corporations, since such corporations tend to be very "selfish" when it comes to their money.
B. Borrow money because by definition, you lend money to an entity when you buy a bond from it. You give the entity the power to borrow. The U.S. government has the power to regulate commerce, levy taxes, print and coin money regardless of bond issurance. Buying bonds does not increase the power.
Hope this helps