Why Brazilians see Lula's win as a rebuke to US meddling

Brazilian President Luiz Inácio Lula da Silva has defied polls, precedent and global anti-incumbent sentiment to be elected to a fourth term in a run-off.
With every vote counted, Brazil's electoral court says Lula won 51.8 per cent, a lead of nearly 4.4 million votes over Flávio Bolsonaro, who is refusing to concede.
So with a hostile Congress and a politically divided country, how much of his social welfare agenda can Lula deliver?