21. The period from 1865 to 1920 was one of inventions in the United States. Name one invention in communications and one in transportation from this period that had an important impact on the lives of Americans. Explain how each invention affected people's lives.

“obamacare”: included a provision for government-run health insurance called “the public option.” was bitterly opposed by congressional republicans because most favored a “single-payer” plan. survived two challenges to its constitutionality. was partially repealed in 2013 in order to avert a government shutdown. led to the expansion of medicaid in republican controlled states.