Spouse can be used for either husband or wife, yes.
A spouse is your companion, your mate, your partner. In ye olden times, spouse was used as a verb meaning “to marry,” but nowadays, it functions as a noun referring to either husband or wife.
The word 'spouse' can be used to refer to the husband or the wife. A wife can refer to the husband as her spouse, and the husband can refer to the wife as his spouse. The word comes from the Latin 'sponsus' meaning to pledge or promise. 'Wife', on the other hand, is used to refer to the female partner in a marriage.
If she is a Queen, in medieval times, she would be addressed as Her Grace/Her Highness/Her Royal Highness/Lady Queen. In the early modern and modern period, she'd be Her Majesty. If she was an Empress she'd be either Her Majesty or Her Imperial Majesty. If she was a princess she'd be Her Highness or Her Royal Highness.
Traditional letter-writing etiquette is based on traditional professional and marital patterns derived from the following assumptions: A married couple is made up of a man and a woman. The man's name, with the appropriate honorific, goes first. A married woman takes her husband's surname.
In summary, ``husband'' and ``wife'' are more traditional and specific, typically used in formal, marital contexts. ``Spouse'' is inclusive and gender-neutral, suitable for both formal and informal situations.
Spouse can be used for either husband or wife, yes.
You cannot file anyone else's application for naturalization as a US citizen. Each legal permanent resident (green card holder) must file his/her own application after the mandatory period of being a permanent resident (at least three years for a spouse).
A U.S. citizen may acquire foreign citizenship by marriage, or a person naturalized as a U.S. citizen may not lose the citizenship of the country of birth. U.S. law does not mention dual nationality or require a person to choose one citizenship or another.
Use "Mr. and Mrs. His First Name Last Name" for a traditional approach. Although the rules of etiquette are quickly changing, traditionally couples are addressed using the husband's name.