First to answer will get brainliest! which regions on this map were once mexican possessions?   -midwest and southwest -northwest and southern west coast -southwest and northeast -southwest and southern west coast

The answer is southwest and southern west coast i believe

Explanation:

  Southwest and southern West Coast.

Explanation:

  By the year 1821, the territorial organization of the First Mexican Empire was the largest extension of Mexico as an independent country. It held the territories of California, Texas, and New Mexico.

  Through the years the empire was diminished from the south but it was not until 1836 when the Texas region declared its independence that the northern regions began to fall apart. In 1845 the United States annexed the Texas territory.

  Finally, in 1848 the Treaty of Guadalupe Hidalgo ended the Mexican-American war, forcing large territorial concessions by Mexico.

  I hope this answer helps you. I attached an image to show the extension of the First Mexican Empire.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.