Context: After the Mexican War of Independence from Spain also, California, Nevada, Arizona, Utah, western Colorado and southwestern Wyoming became part of the Mexican territory of Alta California and most of New Mexico, western Texas, southern Colorado, southwestern Kansas, and Oklahoma panhandle were part of the territory of Santa Fe de Nuevo México. The geographical isolation and unique political history of this territory led to New Mexican Spanish differing notably from both Spanish spoken in other parts of the United States of America and Spanish spoken in the present-day United Mexican States.

Question: When did other states become part of Mexico?
Answer: After the Mexican War of Independence from Spain

Question: What states made up of Alta California
Answer: California, Nevada, Arizona, Utah, western Colorado and southwestern Wyoming became part of the Mexican territory of Alta California

Question: What states were part of Santa Fe de Nuevo
Answer: most of New Mexico, western Texas, southern Colorado, southwestern Kansas, and Oklahoma panhandle were part of the territory of Santa Fe de Nuevo México

Question: Why is  there still Bilingual  spoken in these states?
Answer: The geographical isolation and unique political history of this territory

Question: When did other states become part of Colorado?
Answer: Unanswerable

Question: Why is there still bilingual spoken in Mexico?
Answer: Unanswerable

Question: What did Spanish in Spain differ from?
Answer: Unanswerable

Question: What was North Dakota a part of?
Answer: Unanswerable

Question: What was Nebraska a part of?
Answer: Unanswerable