美国同性婚姻认可进步神速，已有18个州认可，约占总人口40%

choz

根据wiki，截止到2013年12月22日，全美共有18个州（包含DC）承认同性婚姻，占全美人口39.2%。另外还有4个州承认同性伴侣，和之前加起来一共占全美人口的44.8%。已经接近半壁江山！

http://en.wikipedia.org/wiki/Sam ... n_the_United_States

States that license same-sex marriage (table)[edit]
Note: This table shows only states that currently perform same-sex marriages or have legalized it. It does not include states that recognize same-sex marriages but do not perform them.
States (and D.C.) with same-sex marriage
State or federal district        State population
(US Census estimate 2012[100])        Legalization date        Effective date        Legalization method
1.         Massachusetts        6,646,144        November 18, 2003        May 17, 2004        Massachusetts Supreme Judicial Court ruling in Goodridge v. Department of Public Health.
2.         California        38,041,430        May 15, 2008        June 16, 2008        California Supreme Court ruling in in re Marriage Cases. Same-sex marriages were permitted for some months until they were suspended upon the passage of Proposition 8 on November 5, 2008.
August 4, 2010        June 28, 2013        In Perry v. Schwarzenegger, Proposition 8 was ruled unconstitutional on August 4, 2010. The case reached the U.S. Supreme Court after an appeal in the 9th Circuit. The U.S. Supreme Court ruled that the official proponents of Proposition 8 lacked standing to appeal in federal court due to a lack of direct injury required by well-established precedential standards. (June 26, 2013) Same-sex marriages resumed on June 28, 2013.[49]
3.         Connecticut        3,590,347        October 10, 2008        November 12, 2008        Connecticut Supreme Court ruling in Kerrigan v. Commissioner of Public Health, subsequently passed by the Connecticut General Assembly as Public Act 09-13.
4.         Iowa        3,074,186        April 3, 2009        April 27, 2009        Iowa Supreme Court ruling in Varnum v. Brien.
5.         Vermont        626,011        April 7, 2009        September 1, 2009        Passed by the Vermont General Assembly (overriding Governor Douglas' veto).
6.         New Hampshire        1,320,718        June 3, 2009        January 1, 2010        Passed by the New Hampshire General Court.
-         District of Columbia        632,323        December 18, 2009        March 9, 2010        Passed by the Council of the District of Columbia.
7.         New York        19,570,261        June 24, 2011        July 24, 2011        Passed by the New York State Legislature (Marriage Equality Act).
8.        Washington (state) Washington        6,897,012        November 6, 2012        December 6, 2012        Passed by the Washington State Legislature; approved by voters in Referendum 74.
9.         Maine        1,329,192        November 6, 2012        December 29, 2012        Approved by voters in Question 1 (2012).
10.         Maryland        5,884,563        November 6, 2012        January 1, 2013        Passed by the Maryland General Assembly and upheld by voters in Question 6 referendum.
11.         Rhode Island        1,050,292        May 2, 2013        August 1, 2013        Passed by the Rhode Island General Assembly.
12.         Delaware        917,092        May 7, 2013        July 1, 2013        Passed by the Delaware General Assembly.
13.         Minnesota        5,379,139        May 14, 2013        August 1, 2013        Passed by the Minnesota Legislature.
14.         New Jersey        8,864,590        September 27, 2013        October 21, 2013        New Jersey Superior Court ruling in Garden State Equality v. Dow.
15.         Hawaii        1,392,313        November 13, 2013        December 2, 2013        Passed by the Hawaii State Legislature (Hawaii Marriage Equality Act).
16.         Illinois        12,875,255        November 20, 2013        June 1, 2014        Passed by the Illinois General Assembly.
17.         New Mexico        2,085,538        December 19, 2013        December 19, 2013        New Mexico Supreme Court ruling in Griego v. Oliver.
18.         Utah        2,855,287        December 20, 2013        December 20, 2013        United States District Court for the District of Utah ruling in Kitchen v. Herbert.[101]
Subtotal        —        123,031,693
(39.2% of the U.S. population)        —        —        —
States with other relationship laws (table)[edit]
Note: This table shows only states that currently have same-sex relationship laws other than full marriage. Some states that now have same-sex marriage originally had civil unions or domestic partnerships (or still do), but those states are not shown here.
States with unions granting rights similar to marriage
State        State population
(US Census estimate 2012[100])        Legislation date        Effective date        Legislation name
1.         Oregon        3,899,353        May 9, 2007        February 4, 2008        Oregon Family Fairness Act (domestic partnerships)
2.         Nevada        2,758,931        May 31, 2009        October 1, 2009        Domestic Partnership Responsibilities Act
3.         Wisconsin        5,726,398        June 29, 2009        August 3, 2009        2009 Wisconsin Act 28 (limited domestic partnerships)
4.         Colorado        5,187,582        March 21, 2013        May 1, 2013        Colorado Civil Union Act
Subtotal        —        17,572,264
(5.6% of the U.S. population)        —        —        —
Total        —        140,603,957
(44.8% of the U.S. population)        —        —        —