Was he still considered a terrorist by the US
It's so much worse than just Ronald Reagan and Margaret Thatcher calling Mandela a "terrorist".
When congress passed anti-apartheid sanctions, Reagan vetoed them, and then actively called the Senators before the veto override vote to try to convince them to let it stand. Congress went ahead and overrode the veto, giving Reagan one of his worst political defeats as president. It was the only time in the 20th century when congress overrode a president's veto of a foreign policy bill.
Reagan still refused to enforce the sanctions against the apartheid regime, asking South African President Botha to call congress himself and lobby to have the sanctions lifted.
Reagan's successor, George H W Bush, included in his platform a promise to enforce the sanctions to their fullest extent, which he ultimately did.
Mandela's legacy will ring out long after Reagan and Thatcher's have been relegated to the trash.
I continue to feel Reagan is overrated. Mandela was the Gandhi of our time.