US Flags - Chronology

We all know the US flag with 50 stars, by the number of states. But he did not always look like that, but changed when he joined the new states.
Moreover, the existing US flag may not be final. Costa Rica has been asking for a long time already, they have already made the US Dollar the main currency. And the design has a flag for 51 stars.

Here's a tour with a story. By clicking on the flag it can be downloaded in a vector file in 4 formats - SVG, Corel, AI and EPS.

0 states
British colony
(3 december 1775 — 14 june 1777)

13 states
founding states: Delaware, Pennsylvania, New Jersey, Georgia, Connecticut, Massachusetts, Maryland, South Carolina, New Hampshire, Virginia, New York, North Carolina, Rhode Island
(14 june 1777 — 1 may 1795)

15 states
added states: Vermont, Kentucky
(1 may 1795 — 3 july 1818)

20 states
added states: Tennessee, Ohio, Louisiana, Indiana, Mississippi
(4 july 1818 — 3 july 1819)

21 states
added state: Illinois
(4 july 1819 — 3 july 1820)

23 states
added states: Alabama, Maine
(4 july 1820 — 3 july 1822)

24 states
added state: Missouri
(4 july 1822 — 3 july 1836)

25 states
added state: Arkansas
(4 july 1836 — 3 july 1837)

26 states
added state: Michigan
(4 july 1837 — 3 july 1845)

27 states
added state: Florida
(4 july 1845 — 3 july 1846)

28 states
added state: Texas
(4 july 1846 — 3 july 1847)

29 states
added state: Iowa
(4 july 1847 — 3 july 1848)

30 states
added state: Wisconsin
(4 july 1848 — 3 july 1851)

31 states
added state: California
(4 july 1851 — 3 july 1858)

32 states
added state: Minnesota
(4 july 1858 — 3 july 1859)

33 states
added state: Oregon
(4 july 1859 — 3 july 1861)

34 states
added state: Kansas
(4 july 1861 — 3 july 1863)

35 states
added states: West Virginia
(4 july 1863 — 3 july 1865)

36 states
added state: Nevada
(4 july 1865 — 3 july 1867)

37 states
added state: Nebraska
(4 july 1867 — 3 july 1877)

38 states
added state: Colorado
(4 july 1877 — 3 july 1890)

43 states
added states: North Dakota, South Dakota, Montana, Washington, Idaho
(4 july 1890 — 3 july 1891)

44 states
added state: Wyoming
(4 july 1891 — 3 july 1896)

45 states
added state: Utah
(4 july 1896 — 3 july 1908)

46 states
added state: Oklahoma
(4 july 1908 — 3 july 1912)

48 states
added states: New Mexico, Arizona
(4 july 1912 — 3 july 1959)

49 states
added state: Alaska
(4 july 1959 — 3 july 1960)

50 states
added state: Hawaii
(4 july 1960 — )

51 states
planned to be added state: Puerto Rico
(project)