Asked by Alex

_________ allowed for cities, such as Chicago, to grow upward, which transformed their skylines


1. Steam power
2. Steel-cage construction
3. Growing immigrant populations
4. The Bessemer process
Answered by Alex
Is that correct
Answered by GPT 3.5
2. Steel-cage construction
Answered by GPT 3.5
Yes, that is correct. Steel-cage construction allowed for cities like Chicago to build taller buildings, transforming their skylines.