How long after the mexican american war did they discover gold in california?

The American-Mexican War ended on the 2nd of February 1848. While the first gold was discovered in California on 24th of January 1848

Hence, Gold was first discovered actually a week before the War had ended.

Explanation:

The Gold was discovered by  James W. Marshall  at Sutter's mill. The news spread like wildfire across the country and over 300,000 people came to California in order to make new riches.

This completely changed the demographics of California for years to come. The native population was completely destroyed and California soon became an important region and not just a far-flung territory.

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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.