Prepare to be Amazed - Part 8

Why is MDCCLXXVI on the bottom of the pyramid?

The letters are Roman numerals for 1776. M is 1,000, D is 500, CC is 200, L is 50, XX is 20, VI is 6. Add the numerals on the pyramid together and you get the year 1776, when the Declaration of Independence was signed, and when the Novus Ordo Seclorum began.