One of the greatest achievements of the Maya civilization was: using canals to direct water to crops.

dividing up wealth and power equally.

uniting many city-states under one government.

letting women do the same jobs as men.

Using canals to direct water to crops

Explanation:

I got it right:)

since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.