Worth 20 trillion of government “bonds”

Trump came to power after Obama attack day by day powerful, and some places even personal attacks. Many people do not understand why, but if you know that Obama left Trump is a mess, you may be empathy.
One of the problems is that on March 15, when Obama's departure from Trump's 20 trillion debts is about to expire, Trump is faced with the dilemma that can not continue to issue bonds.

and now the all world is selling US Treasury bonds, as of the end of November 2016 12 months, overseas central banks to sell the total amount of US debt reached 405 billion US dollars, once again refresh the historical record.
What is the concept of $ 20 trillion? If the US debt with a dollar dollars into the line, then this line can be connected to the Earth and Uranus. My God, Uranus is a bit far away. If the "per capita" standard to calculate, this figure is even more impressive, each US taxpayer debt up to 16.7 million dollars.
Basically, the United States as the world's largest debtor, the face of 20 trillion dollars in debt, the United States of course hope that the dollar depreciation because they do not have to pay so much money. But Trump is trying to engage in infrastructure spending to increase government spending at the same time, the global central banks are selling US debt, and bond yields continue to remain high, then Trump will become a currency war loser, the end result is to the United States Bring the depreciation of the dollar. Can see Trump now in the end is more hate Obama.
I think Donald Trump since the beginning of 1939, the US debt ceiling has been raised 105 times, almost every 9 months will be raised once. So the US Congress to reach a modified debt ceiling bill is a high probability of events. In addition to attacking Obama caused a sharp rise in debt, Trump in the congressional speech did not have too much involvement in the debt problem, but kept trying to expand the financial expenditure.