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The population grew at an annual rate of over 3% throughout the 18th century, doubling every 25 years or less. [ 5 ] : x By 1775 the population had grown to 6.1 million, of which 2.1 million were white, 540,000 black and 3.5 million Native American, giving the colonies about one-third of the population of Britain.
At the end of this epoch, the spherical volume of space which will become the observable universe is about 300 light-years in radius, baryonic matter density is on the order of 4 grams per m 3 (about 0.3% of sea level air density)—however, most energy at this time is in electromagnetic radiation. Photon epoch: 10 s ~ 370 ka: 10 9 K ~ 4000 K