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By the time the U.S. entered World War II in 1941, Nescafé was already in the emergency rations of every departing U.S. soldier , so the hundreds of thousands of American soldiers who occupied Japan from 1945-1952 would have been familiar with it and likely brought it with them.
However, coffee didn't immediately become popular in Japan. During World War II, the Japanese government established a ban on coffee imports that lasted until 1950 , which limited its availability during the early occupation period.

Nescafé's introduction significantly increased coffee consumption and created new coffee fans, particularly during and after World War II.
U.S. per capita coffee consumption actually peaked in 1946 at 46.4 gallons per person - right after the war when Nescafé had become widely popular. During World War II, Nescafé's sales volumes doubled, showing rapid growth in popularity.

Brazil faced a coffee surplus problem in the 1930s.
The Great Depression of 1929 caused a dramatic decline in the global economy and demand for coffee.
Consumers around the world had less money to spend on non-essential goods.
International trade contracted sharply, making it difficult to export Brazilian coffee.
Brazil had dramatically expanded its coffee production in the 1920s, a time when prices were high and demand was strong.
By the time the depression hit, the country had large plantations producing far more coffee than the global market could absorb.

As part of the Doi Moi policy, Vietnam enacted the Foreign Investment Law in 1987.
This allowed foreign companies to establish operations in Vietnam.
Since then, investment by foreign companies in Vietnam has become more active.

After the coffee crisis of 1989, commodity coffee prices became a kind of financial product, leading to price instability. Furthermore, under the Doi Moi policy implemented in 1986, the emerging Robusta coffee producer Vietnam rapidly increased its supply through national policy, threatening even Brazil, the leading coffee-producing country. This led to a decline in export prices from Latin America and Africa.
When prices fell, farmers in coffee-producing countries were unable to sell their coffee, even if they lowered the price, and their incomes fell.