Mao is addressing the youth of China. His red book policies and communist placements are targeting the youth to gain their support and therefore brainwash them and gain a stable support force for communism.
The first one is Frida Kahlo was influenced by mexican indigenous cultures and the second one is Frida Kahlo often wore traditional native clothing.
Johann Gutenberg invented the printing press<span> in the 1450's, </span>
Lewis and Clark were partners in this investigation. York was Clark´s slave and Sacajawea was their translator when they had to the indigenous.