Why did the United States declare war with Spain on April 21, 1898? A. to test the strength of its newly developed military and navy B. to annex the Philippines, Puerto Rico, and Guam C. to avenge the sinking of a US battleship by "Butcher" Weyler D. to free the Cubans and protect American interests

Marine exptoration of oil uses seismic waves to locate oil in the seabed. what is a negative impact from seismic waves on the aquatic ecosystem of the ocean? a. seismic waves kill microoganisms b. seismic waves disrupts the sand and causes seafloor erosion c. seismic waves have virtually no adverse affects on marine life d. seismic waves damage the sonar that dolphins and whales use to orient themselves underwater

At the beginning of the war, why was hitler allowed to continue his aggression without resistance from other european countries

How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.