Accordingly, in 1957, Wachuku was the Leader of the Nigerian Federation Delegation to the Commonwealth Parliamentary Association Meeting held in India, Pakistan and Ceylon, now Sri Lanka. He also represented Nigeria in Liberia during the opening of the New Parliament Building in Monrovia. From 1958 to 1959, Wachuku was Chairman of the Business Committee in the House of Representatives of Nigeria. He was also a member of the Parliamentary Committee on the Nigerianization of the Federal Civil Service. He wrote the committee's Report assisted by Michael O. Ani. In 1959, Wachuku was re-elected into the House of Representatives from Aba Division; and was, subsequently, elected the first indigenous Speaker of the Nigerian House of Representatives.