Steam because they had steam engines for the first time during the industrial revolution.
D (4.) Courses are available on the Internet, starting in kindergarten.
For students who cannot go to school there is home schooling/ virtual schooling now. This provides parents and children easy affordable online classes so that their children can still get an education.
One way Hitler maintain power and control over the people was the Nazis rise to power was propaganda. The Nazis used propaganda throughout the late 1920’s and early 1930’s to boost Hitler’s image, and, as a result of this and other aspects, he became extremely popular.
The Aksumite Empire ended with the last King, Dil Na’od who was defeated by his former General Mara Takla Haymanot who founded the Agaw Zagwe dynasty. According to legend, a son of Dil Na’od fled in exile, until his descendants overthrew the Zagwe dynastic rulers and re-established the Solomonic dynasty around AD 1270.