From 1982 to 2000, coincident with the great Reagan bull market in stocks, the average report of real GDP for the second quarter was 4.4%.
Trump was going to make America like that again.
At an average report of 2.6% so far, he has no grounds for saying America is back, let alone greater than ever before. He's doing better than Obama at 2.3%, but that's about it.
The economy shrank dramatically after 2000, and no one has figured out how to fix it.