Mariachi costume for men; huipil dress for women. You should note however, that these are used for festivities and other special occasions; you won't see any Mexican wearing any of these during their day-to-day activities (e.g. they wear western clothing).
Maya or Mayan
Mexican, which is a nationality indistinct of race.
Mestizo
The arrival of the Europeans did not affect the native americans in Mexico.
Native Americans on the Trail of Tears wore "period clothing" (clothing normal for that period in time). This included a great variety of clothing, mixed between traditional Native Clothing and European clothing.
While not specifically from Mexico, sunflowers are native to the Americas.
Yes Mexico allows used clothing into their country.
Casual clothing
Poinsettias, Mexican marigold flowers and dahlias are native to Mexico.
They are native to New Mexico
Salmon is not native to New Mexico. However, sockeye salmon thrive in some of New Mexico's lakes that are deep and cold.
On the contrary; most Native American population resides on the southern states of Mexico.