Answer:
the meaning of merits is advantages
The correct answer to this open question is the following.
Although the question is incomplete because it does not refer to a specific moment or place in the history of the US, we can say that if it refers to President Abraham Lincoln's Emancipation Proclamation of 1863, then his new freedom was 'inconceivable" to African Americans in the southern states until the Union Army won the American Civil War in 1865. However, although the ratification of the 13th Amendment to the Constitution of the United States happened in December 1865, the road to freedom for African Americans in the south was long to come. During Reconstruction, Jim Crow Laws and the Black Codes were southern legislations that limited freedom and the civil rights of Black people.
It was the Truman Doctrine.
The Iron Curtain was the metaphorical barrier that seemed to split the Eastern Bloc from Western Europe. It was first mentioned by Churchill. The Berlin Wall was the physical embodiment of this "Curtain" that was constructed by the USSR to prevent Eastern Europeans from migrating. The Marshall Plan sent $13 billion to European nations to help them rebuild after WWII. The Truman Doctrine was specifically put in place to contain communism by aiding nations that were "at risk" so they would not turn to communism to solve their problems.
Dr Jonas Salk developwd the vaccine to prevent polio.
After the defeat of his warriors at the Battle of Fallen Timbers in 1794 and signing the Treaty of Greenville in 1795, Little Turtle refused an alliance with the Shawnee chief Tecumseh. Little Turtle continued to advocate for peace and accommodation instead of conflicts.
