Answer:
It was unofficially celebrated in a number of cities and states as early as the 18th century, but did not become a federal holiday until 1937. For many, the holiday is a way of both honoring Columbus' achievements and celebrating Italian-American heritage.
Explanation:
The Byzantine theme of the Holy ratification of Church and State was evident during the mosaic program in the Apse of San Vitale and the presence of Christ and Justinian serves as the support of this theme during this mosaic program.
Four empires collapsed: the Russian Empire in 1917, the German and the Austro-Hungarian in 1918
