Of these four, who do you think was the best philanthropist? Why?

Bill Gates and Warren Buffett frequently top the list of biggest philanthropists.

Explanation:  In 2018, Buffet donated $3.4 billion to foundations dedicated to women's rights, social justice and fighting poverty, and has also donated to the Bill and Melinda Gates Foundation.

Reconstruction

Explanation:

Reconstruction, in U.S. history, the period (1865–77) that followed the American Civil War and during which attempts were made to redress the inequities of slavery and its political, social, and economic legacy and to solve the problems arising from the readmission to the Union of the 11 states.