When did the first substantial urban centers with concentrated populations and monumental architecture emerge in the mayan world?

Why were the numbering trials held from 1945 to 1946 ?

In order to maintain national security within its colonies in america, england constructed a series of forts along colonial boundaries for protection. true false

The victory of andrew jackson in the presidential elections of 1828 was aided by (1) the support of eastern bankers (2) implementing woman's suffrage (3) reducing property qualification for voting (4) the endorsement of northern abolitionists