Japan’s population decline the steepest on record

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5. This is a result of economic depression.

When economies crash and never get up as did Japan's the younger generations puts off having children and getting married. Sometimes they put it off so long that they don't have children at all.

"The Lost Decade or the Lost 10 Years is the time after the Japanese asset price bubble's collapse within the Japanese economy. The term originally referred to the years from 1991 to 2000, but recently the decade from 2001 to 2010 is often included, so that the whole period of the 1990s to the present is referred to as the Lost Two Decades or the Lost 20 Years. Over the period of 1995 to 2007, GDP fell from $5.33 to $4.36 trillion in nominal terms, real wages fell around 5%, while the country experienced a stagnant price level. While there is some debate on the extent and measurement of Japan's setbacks, the economic effect of the Lost Decade is well established and Japanese policymakers continue to grapple with its consequences."

Coming to the US very soon.