The year long bull rally that took place in 2017 had very little to do with Donald Trump, and the recent correction was simply a combination of profit taking and effects of inflation due to rising interest rates. The American market has been on the rise for the past 4 years, and 2017 was a bullish year due to rapid advancement in technology and investor confidence surrounding a likely Tax cut that would come from Congress. People forget that the budgets and tax policies are made by the legislative branch, the POTUS can only influence them through the bully pulpit.

The Federal Reserve has been intentionally keeping interests rates at near zero since the financial crisis, and now that the economy has been deemed healthy, they will begin to rise. This can already be felt when you see the USD has begun to inflate in value, which has a massive effect on the equities market because REAL dollar value begins to shrink off the bottom line due to inflation. It's the reason that most Wall Street investors literally short-sell the currencies in the markets where their equities are because it will protect against inflation. The small gains that the middle class will feel from the Ryan tax plan will also get eaten by inflation. There is no grand conspiracy here, it is simply inevitable because the dollar has been falsely held at a much higher value due to Federal Reserve policies.