It’s D because in the 1960 they sort of had a connection.
This possibly led to the creation of small and new countries that were once colonies of bigger countries
Wyoming. Montana and Idaho where all once apart of the Oregon territory
During high periods of unemployment countries should focus on stimulating investments in the economy. this can be achieved through an expansionary fiscal policy that increases money supply in the economy, through tools such decreased taxation,reduced government borrowing and increased government expenditure.