As an actor, Spencer Tracy stood for–in fact, epitomized–the rugged, down to earth, matter of fact, fair-minded, hard-working American.
He mostly played grounded, highly intelligent and practical men, who put to use their distinctive personality, rational behavior, and human intelligence for a good collective goal.
In some films, it is through ambition and hard work and integrity that his characters rose through the ranks and reached the top of their professions.