Operation Barbarossa was the Nazi German military invasion of the "USSR", since this was the famous surprise attack by Germany that broke the Nazi-Soviet Pact in World War II.
The first picture , because the message is big and clear.
Trans-Saharan trade routes promoted the growth of powerful trading cities in the time period because they traded valuable items like slaves, gold, and salt, which increased the net worth of the cities and allowed for economic growth that way. Because of the trading, the Trans-Saharan cities could grow
There are 4 conditional waves of Russian immigration to the United States.
The first was connected with the Russian development of America in the 18th-19th centuries and was represented by small Russian researchers who founded settlements along the Pacific coast.
The second took place at the turn of the 19th and 20th centuries and was represented by Jews from the Russian Empire.
The third - a small wave - was represented by political emigrants (mostly also Jews) from the USSR in the late 60s and early 70s.
And, finally, the most massive influx (the fourth wave) occurred during the fall of the Iron Curtain in the late 1980s and early 1990s, when numerous groups of Jews, Russians, Ukrainians and others arrived (mainly already at the turn of 20-21 centuries).
Hippocrates was the founder of medicine, regarded as the greatest physician of his time, based medical practice on observations of the human body. Where as Herodotus wrote about the wars between Persia and Greece and he became one of the first true historians in Western civilization.
