The four major civilizations of Mesoamerica were Aztec, Maya, Inca, and Olmec. Two inventions of the Maya were canals and the well-known calendar. These two inventions help me and the world for two reasons. Canals help me because it gets goods and products to my area, from the other side of the continent. Calendars help me in everyday life because they help me keep track of important dates.
Hope this helps you!