The correct answer is: "the end of American neutrality in World War II"
The Lend-Lease Act was a program enacted in the US in 1941 to provide support to Allied countries so that they could defeat the axis forces (nazi Germany, fascist Italy and the Japanese Empire) in WWII, but the US had not decided to directly participate in the conflict yet.
The program consisted on the distribution of food, oil, and all types of military materials and it remained functioning since 1941 until the end of the conflict in 1945.
scientific enlightment evolved between the 16 &1700's, the age of reason, then followed the scientific resolution in the 19th century. the scientific resolution created the first "scientific societies. by 1870, these societies dismissed alchemy and astronomy displaced & other pseudosciences, as being proven untrue.
The words in the excerpt stated above which best show that Giblin views the Rosetta Stone as very important are the following: more valuable and famed. The adjective "more valuable" indicates value and worthy while "famed" indicates popularity or highly acclaimed.
