He did not. The first race in the Triple Crown is the Kentucky Derby. The Derby is restricted to three year olds. Seabiscuit was a late bloomer, when he was three he was lame and cranky due to overwork and excessive training. To compete at that level he would have had to be winning consistantly against some very tough competition.
He did not. The Kentucky Derby is restricted to 3 year olds. Seabiscuit didn't really start winning until he was around five. As a young horse he did not show any promise as a great race horse.
No, Seabiscuit never raced in any of the Triple crown races.
Winning Colors won the Kentucky Derby in 1988.
1978
In 1948.
Not the US Triple Crown. But he did win the UK Triple Crown.
1966
1930
1977. When he died in 2002 he was the last living Triple Crown winner.
This can't be answered unless you give a list of horses.
Secretariat won the triple crown in 1973. He was the 9th horse to do so in 25 years.
Bahram won in 1935 :)
No the last triple crown winner was Affirmed 1978