Why were the countries of europe so keen to avoid another war?

Prior to the presence of europeans on the continent, the slave trade in africa a) did not exist in any form. b) was limited to internal trade only. c) included the trans-saharan and indian ocean slave trade. d) was rarely needed due to the lack of an agricultural economy.

What were four reasons for the decline of spain as a world power

What types of subjects did public high schools in the 1900s emphasize and why