Which of these Roman developments resulted in the ability to build larger and more stable structures?

The Answer is: columns

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

on this day in 1833, president andrew jackson announces that the government will no longer use the second bank of the united states, the country's national bank. a national bank had first been created by george washington and alexander hamilton in 1791 to serve as a central repository for federal fund