Cilantro and Cumin.
Cannot speak as to Mexico, but in the US they are most often used for children's birthday parties.
If by often you mean the longest, yes it is. It kept Mexico as a colony from 1521 until 1821 when Mexico fought an won its independence war.
Mexican Chicken, a national dish, is named after the Country name in the dish - Mexico! This has been called the "National Dish" of Mexico. This is often used as a spicy dish with chillies.
No, vosotros is not used in Mexico.
The Poinsettia, [ Euphorbia pulcherrima] is a native plant of Mexico.
Taco
The term 'la chula' originated from Spanish in Mexico. It means 'the cool' in Spanish, but is not often used. It is sometimes used as a title for someone or something.
Yes Mexico allows used clothing into their country.
Yes, in fact the IFE's voting credential is the de facto national ID card for Mexicans. It is the piece of ID most often used by Mexicans in Mexico when they need to show ID.
Mexico uses LPG.
Mexico.
When saying Mexico with a spanish accent, it often sounds like Meh-heek-oh.