Answer:
b. Astronomy.
Explanation:
Mayan astronomy, which indeed, is based on observation and a highly refined mathematical system, is the specific field in which the Pre-Columbian Mayan civilization excelled, even to a higher degree than their European contemporaries. Their measurements of astronomical phenomena allowed them, amongst other things, to predict eclipses and ascertain the best time to harvest. Some of the calculations of the Mayan civilization still marvel contemporary scientists.
Yes, it did. The Indians helped the British.
A second reason the Fugitive Slave Act of 1850 angered Northerners was that it "<span>A. contradicted pre-existing personal liberty laws," since many Northerners felt that their rights were being infringed upon as well. </span>
The powerful nations of Europe were ready to formally expand their empires into Asia and Africa. Known as New Imperialism, this desire for expansion was motivated by many things, not the least of which were the promise of economic growth, the sting of national rivalries, and a sense of moral superiority.