Put these in order, top to bottom, from earliest to most recent world war ii breaks out in europe, the egyptian pyramids are built. the first human walks on the moon. the wheel is invented. the united states of america is founded.

The Pyramids 2630 B.C. , The wheel was made 3,500 B.C , The united states is founded July 4 1776, world war II broke out September 1, 1939, First human to walk on moon July 20, 1969.

Explanation:

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the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.