A Two Picture History Of The Randomized Control Trial

Many people consider the randomized control trial the gold standard for assessing medical interventions. The US government has been a major funder of such trials, as illustrated in this picture which shows that the government funds just about as many RCTs as private industry:
Despite so much US funding for RCTs, the location of such trials has steadily moved to other countries:
For some reason, the United Kingdom seems to have gone by the clinical trial wayside. Even before Brexit. Go figure!