Answer:
a. Massachusetts
b. Iowa
Step-by-step explanation:
a. Massachusetts
Massachusetts as a state in the U.S. started to recognize and allow same-sex marriage on 17 May 2004. This followed the Supreme Judicial Court of Massachusetts that ruled in Goodridge v. Department of Public Health. The ruling stated it was unconstitutional under the Massachusetts constitution to prevent couple of the same sex from getting married.
b. Iowa
Iowa as a state in the U.S. started to recognize and allow same-sex marriage on 3 April 2009 as a result of a decision of the Iowa Supreme Court of that day. On 27 April of the same year, marriage licenses started to be made available to same-sex couples.