<span>The most important advancement that was made by the Maya was B. the 365 day calendar.
This calendar has survived hundreds of years and is still used today. The Maya's were also the ones who developed the concept of the number zero, they predicted the lunar eclipses, and also tracked the cycles of the moon, planets, and stars. The Mayans used this technology they developed to plan for proper harvesting and crop rotations.</span>
1975 was the year Vietnam was reunited
<span>It was the Crusades.
The Crusades was a campaign to regain the Holy Land from the Muslim
invaders after they took it over. Some
came to fight for that goal while others joined to see new lands while some
were after the riches that be taken from that area. Many were promised forgiveness of their sins
if they joined the Crusades. Still, some
of the effects of the Crusade were that the Mediterranean was open to trade as
soldiers and markets were established.
Other effects were that it led to the growth of towns and cities as the
nobility sold their lands to join the Crusades and the people gained their
freedom. Finally with the growth of towns, feudalism was weakened.</span>
The Classical Era set the scene. It brought us the major civilizations, religions, and trade routes. But, what happens when all of the major world powers collapse? This is the Post-Classical era. The major world powers come from places you might not expect. There are some powers that are similar to the ones before and the ones after (Byzantine, China). But, the major players in the Post-Classical era come from totally backwards places. One sprouts out of a cave in the Arabian desert. The other comes from the base of a mountain on the steppes in Central Asia. I call this era, Muslims & Mongols. That's not everything, but it just about sums up the basics. (Of course, Trade, Migrations, Religion, and Labor are important...) The Post Classical Era is the FIRST era that represents 20% of the test. From here on out, these eras are worth more than the first two.
