Use this timeline to answer the question below. 1600
1650
1700
1750
1800
1850
1900
1950
2000
1776 - The United States declares
| 1607 - The British colony of Jamestown is founded.
1636 - Harvard College is founded.
I
independence from Great Britain.
1789 - The U. S. Constitution is adopted.
| 1861 – The U. S. Civil War begins.
1917 - The United States enters World War I. |
1945 - The United States drops atomic bombs on two Japanese cities. I.
1969 - American Neil Armstrong becomes the first person to walk on the moon.
Which event happened first?

20 points “the creation of a mosaic was a complicated procedure that called for careful timing and teamwork. . walls were painted with resin or tar before being covered with the first of three layers of plaster. . a sketch of the projected work was then made on the plaster to serve as a guide for the various artisans. the outermost layer of plaster, in which the pieces, or tesserae, of the mosaic would be set, was spread on only enough area to contain a day’s work. some of the tesserae—small, carefully cut fragments of colored glass, marble, and semiprecious stones—were pressed into the wet plaster so that they projected at a slight angle. the stones thereby better reflected light and imbued the finished mosaic with a shimmering life of its own.” —empires besieged: time frame a.d. 200–600 how many layers of materials were under the tiles? a. two- c. four- b. three- d. five