Both presidents were conservative in their policy.
The main difference would be their attitude towards the foreign trades.
President Harding was a determined in secluding United states from foreign trades which ending up in worsening relation with other nations in europe.
President Coolidge on the other hand, is was very open minded about the foreign trade, but he still had to face the negative effect from Harding's decision.
D is the answer to your question. i think.
Manifest Destiny was a distinctly racist concept in the first place. The idea was that white man was destined to conquer the west and this meant subduing anyone else who happened to live there. White man alone was entitled to this "destiny". It used the ideas of Jacksonian democracy of a "white man's democracy" to develop these beliefs.
The Great Migration, or the relocation of more than 6 million African Americans from the rural South to the cities of the North, Midwest and West from 1916 to 1970, had a huge impact on urban life in the United States.
The Alamo. Definition: The Battle of the Alamo was a 13 day siege at a mission in San Antonio that was fought between February 23, 1836 – March 6, 1836 by Mexican forces of about 4000, under President General Santa Anna, against a handful of 180 American rebels fighting for Texan independence from Mexico.