Between 1865 and 1900 an issue that dominated national politics in the united states was

The rise of big businesses is the answer 

Many of the issues dealt with by the courts during this time frame had to do with large companies creating monopolies. Many people were sued over their practices. Today we have Ford, because of a lawsuit that allowed him to enter the automotive industry. Rockefeller was also taken down over his oil monopoly.

Hope that helps.

In my honest opinion , i’d say franklin d roosevelt was a president that impacted our nation , i say this because fdr is voted among top three best us presidents and he was the longest serving president by 3 terms , usually presidents only supposed to have two terms increments of 4 years , equivalent to 8 years total before election time. and he established the fdic , through the 1933 banking act and he established the us , social security system , during his presidency, and established a national minimum wage , through the fair labor standards act , fdr led the allied coalition to victory in wwii and he played a major role in the creation of the united nations.

Internal combustion engines