Place the events in chronological order

What is constantinoples government?

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.

Which of these events was a severe setback for the u.s. war effort in the pacific?