U.S. President Joe Biden speaks as he announces executive actions on gun violence prevention in the Rose Garden at the White House in Washington, April 8, 2021.Kevin Lamarque | ReutersAmericans broadly back the big-ticket spending proposals that have defined President Joe Biden’s first 100 days in office, a variety of recent polls show.Surveys show many more Americans approve than disapprove of the $1.9 trillion coronavirus relief bill Biden signed into law in March — by far his most significant legislative victory to date.Polls also find Biden’s $2 trillion infrastructure plan is already popular with majorities or pluralities of respondents.As he turns the …