Romans 5:19 — For as by one man's disobedience many were made sinners, so by the obedience of One shall many be made righteous.
Made = to render or cause to be
Obedience — This isn't referring to Jesus Christ's sinless life but specifically His death (same as in verse 18), an act of righteousness. (act of righteouness — legal: obedience — moral)
The first "many" includes everyone. The second "many" refers to those who trust Jesus Christ.