Seabiscuit never won the Triple Crown, his nephew War Admiral won it in 1937.
Seabiscuit didn't win the Triple Crown
He did win - twice
No, Seabiscuit never raced in any of the Triple crown races.
Seabiscuit did not run in the TC as a three year old.
Seabicuit. He did not race in the Triple Crown events. All the others you named were Triple Crown winners.
Not the US Triple Crown. But he did win the UK Triple Crown.
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.
1978
In 1948.
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.
The great Secretariat won the Triple Crown in the year 1973.
1930