Final answer:
Teddy Roosevelt's New Nationalism was a Progressive idea aimed at increasing federal government power to regulate businesses for social justice and public interest, including labor and consumer rights.
Step-by-step explanation:
The idea for increasing power of the federal government to regulate business to achieve social justice and equal rights for various groups, known as New Nationalism, was proposed by Teddy Roosevelt in 1910. This political doctrine was a part of the Progressive movement and advocated for a federal government that had enough authority to regulate corporations and the economy in order to promote the public interest. New Nationalism was a significant stance at the time, reflecting Roosevelt's acceptance of Progressive ideas and his belief that only a strong federal government could effectively address the issues of monopolies, consumer safety, labor rights, and economic inequality.
As the Progressives found that their grassroots approach was insufficient to fight against the powerful interests of big business and corruption, they turned to national leadership for support, which they found in Theodore Roosevelt. His acceptance and promotion of New Nationalism sought to harness the power of the federal government to regulate the economy, address social injustices, and ensure fair competition and conditions for workers. Nonetheless, some critics of Roosevelt's policies feared that this increase in federal power could ultimately lead to socialism, with the government acquiring too much control over private property and businesses.