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The national flag of the United States of America, at times also the American flag or the U.S. flag, has thirteen equal horizontal stripes of red alternating with white, with a blue rectangle with fifty white, five-pointed stars arranged in nine offset horizontal rows.The 50 stars on the flag represent the 50 U.S. states, and the 13 stripes represent the thirteen colonies that declared independence and became the first states in the U.S.
Timeline
I only started with the first flags used during the 1775 revolution as there were more in use before and after that period.
• 1775 - Sons of Liberty flag
• 1776 - January - The Grand Union flag is displayed on Prospect Hill.
• 1776 - May - Betsy Ross introduced the first American flag
• 1777 - Optional 13-star flag, in the 3-2-3-2-3 pattern.
• 1777 - June — Continental Congress selects 13-star flag.
• 1795 - Flag with 15 stars and 15 stripes - states added.
• 1818 - Flag with 20 stars and 13 stripes - states added.
• 1819 - Flag with 21 stars - state added.
• 1820 - Flag with 23 stars - states added.
• 1822 - Flag with 24 stars - states added.
• 1836 - Flag with 25 stars - state added.
• 1837 - Flag with 26 stars - state added.
• 1845 - Flag with 27 stars - state added.
• 1846 - Flag with 28 stars - state added.
• 1847 - Flag with 29 stars - state added.
• 1848 - Flag with 30 stars - state added.
• 1851 - Flag with 31 stars - state added.
• 1858 - Flag with 32 stars - state added.
• 1859 - Flag with 33 stars - state added.
• 1861 - Flag with 34 stars - state added.
• 1863 - Flag with 35 stars - state added.
• 1865 - Flag with 36 stars - state added.
• 1867 - Flag with 37 stars - state added.
• 1877 - Flag with 38 stars - state added.
• 1890 - Flag with 43 stars - states added.
• 1891 - Flag with 44 stars - state added.
• 1896 - Flag with 45 stars - state added.
• 1908 - Flag with 46 stars - state added.
• 1912 - Flag with 48 stars - states added.
• 1959 - Flag with 49 stars - state added.
• 1960 - Flag with 50 stars - state added.