Answer:
Herbert Hoover
Explanation:
Calvin Coolidge did not choose to run for re-election in 1928, and the republicans nominated former secretary of commerce Herbert Hoover.
During the primaries, Hoover faced former governor of Illinois Frank Orren Lowden, and Senate Majority Leader Charles Curtis.
Hoover was nominated on the first ballot during the 1928 National Republican Convention, which was held in Kansas City, Missouri.
