I think one of the causes is the effect of trade war between China and America
and also the global economy is weak
I disagree if it is said that the decline in the price of bitcoin is due to trade war between U.S with China. A trade war has been going on for almost two years. And I don't see any connection between trade war and the current decline in the price of bitcoin. Bitcoin prices are moving lower due to the absence of positive sentiment that lifted prices.