The correct answer here is the second option.
When the US helped the Panamanian people win their independence from Columbia they got the rights to build and operate the Panama Canal in perpetuity. But Panamanian people had no say in this and thus over time they wanted it back. After the riots, which were also presumably instigated by the soviet agitators, the conflict arose between Panama and the US. So, because of the riots a new deal was made.
The reform movement in politics, the society, and the economy was known as the Progressive movement.
This movement took several different steps to change American society. This included
A) The development of anti-trust laws- This would clean up the economy and stop monopolies from cornering markets and participating in price gouging.
B) Muckraking- Journalists exposed social ills in American society by writing influential books and using photographs to show things like the horrible working and living conditons of American citizens. This lead to changes in law (like the Meat Inspection Act) that increased consumer and worker safety.
C) 17th amendment- This lead to citizens voting directly for their US Senators instead of having them picked by members of the state legislature. This helped to stop political corruption.
Lexington and concord, april 1775