Final answer:
Dr. Martin Luther King Jr. lobbied Congress for a new civil rights act through protests, letter-writing, speeches, and demonstrations.
Step-by-step explanation:
Dr. Martin Luther King Jr. lobbied Congress to pass a new civil rights act through a combination of protests, writing letters to Congress members, and giving speeches and demonstrations. He organized protests, such as the 1963 March on Washington, to bring attention to the need for civil rights legislation. He also wrote letters to Congress members, advocating for their support. Additionally, he gave speeches and demonstrations to mobilize public support and put pressure on lawmakers.