Answer:
Chapter name......or which class ??
Unrestricted submarine warfare, which became prominent in World War I, meant that submarines could sink any time of vessel at any time without warning. Before this, they had to surface first and place crews on lifeboats.
Answer:
September 1, 1939 – September 2, 1945
Explanation:
The correct answer is the following.
The correct locations are:
The Maya constructed the city of Chichen Itza.
The Maya invented calendar systems that are still used today.
The Inca built rope bridges.
The Maya was a great civilization that existed on the Yucatán Peninsula in Mexico, and some regions of Guatemala and Belice. They built the city of Chichen Itza, where had the impressive Pyramid called "the Castle," and an observatory, because the Mayas were great Astronomers that invented the Maya Calendar called the "Tzolkin," that is still used today.
The Incas were the great prehispanic civilization in South America. They built the monumental city of Machu Pichu in Peru.
