During the past 100,000 years, there were at least ___ glacial periods. a. 4 c. 20 b. 12 d. 60 Please select the best answer from the choices provided A B C D

Why was the u. s. annexation of hawaii delayed until william mckinley became president? a: the rebels who overthrew queen liliuokalani opposed u. s. annexation. b: the senate did not approve the treaty of annexation until mckinley entered the white house. c: supporters of the nationalist cause were in the majority in hawaii until 1898. d: mckinley’s predecessor, grover cleveland, refused to sign the treaty of annexation.