Why was it important for architecture to become a specialized, professional career in the late 1800s?

Architecture was an activity that anyone with some kind of experience on the subject could practice until it became a licensed profession in 1857

The creation of the American Institute of Architects(AIA) in on February 23 of the same year, by Henry Dudley, Richard Morris Hunt, Henry Babcock -among others- "procured the practical perfection of its members". The main purpose was to establish Architecture as a profession,

Among the first schools of Architecture in America in the late 1860's and the beginning of the 1870's, we find the MIT in Boston, Cornell University in New York and the University of Chicago.

the answer is a, salt plain