Why did british colonies rely on africans

When did paul zoll develop cardiac pacemaker

Which of the following created as part of president johnsons great was most directly aimed at breaking the cycle of poverty in the usa department of transportationb medicarec office of the consumer protectiond head start

Examine these two paintings that depict famous events from american history. the image on the left, painted in 1940, shows the signing of the u.s. constitution in 1787. the image on the right, painted in 1836, shows the american victory at the battle of yorktown in 1781.which of these paintings should be considered a secondary source?