By NEW YORK (Reuters) -U.S. stocks rallied on Monday, with each of Wall Street’s main indexes closing at record levels as President Donald Trump’s signing of a long-awaited $2.3 trillion pandemic aid bill increased optimism for an economic recovery.In a sudden reversal late on Sunday, Trump backed down from his threat to block the hard-fought bill, restoring unemployment benefits to millions of Americans and averting a federal government shutdown.“It’s a positive tone to the U.S. market and part of that is the signing of stimulus package by Trump, which appeared to be in doubt but is...…By NEW YORK (Reuters) -U.S. stocks rallied on Monday, with each of Wall Street’s main indexes closing at record levels as President Donald Trump’s signing of a long-awaited $2.3 trillion pandemic aid bill increased optimism for an economic recovery.In a sudden reversal late on Sunday, Trump backed down from his threat to block the hard-fought bill, restoring unemployment benefits to millions of Americans and averting a federal government shutdown.“It’s a positive tone to the U.S. market and part of that is the signing of stimulus package by Trump, which appeared to be in doubt but is...WW…