The two motivation includes the protection of consumers and dismantling of monopolies.
The Progressive Era depict period more emphasis were placed on transparent and accountable government which would work to improve U.S. society.
During this period, there are various reforms about the followings: Right of workers, Civil service reform, Food safety laws, Women Political rights etc
The Anti-trust legislation were set of rule established to protect consumers from predatory practices and to ensure fair competition among producers in the industry.
So, therefore, the protection of consumers and dismantling of monopoly by firm are what spurred the Anti-Trust legislation in the Progressive Era.
Learn more about Anti-Trust Legislation here
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