List four reasons for increased life expectancy in the united states

The four reasons for increased life expectancy is caused by better healthcare,  better nutrition,  better sanitation , and better working conditions. The United States has a really good healthcare system, but could be pricey. The United States has A LOT of food, you can see restaurants, fast food, and supermarkets everywhere, people in the U.S have easy access to food. The U.S is also cleaner than other countries, good water and sewer systems make sanitation good. Finally, the U.S has a lot of job opportunities for people to work.

i do believe its (d) it allowed the government to offer pioneers sixty acres of western land if they lived on it and made improvements to it.

explanation: signed into law in may 1862, the homestead act opened up settlement in the western united states, allowing any american, including freed slaves, to put in a claim for up to 160 free acres of federal land. by the end of the civil war, 15,000 homestead claims had been established, and more followed in the postwar years

the answer is d. selective incorporation. (apex)