Henry Parkes first proposed the idea of an Australian federation in 1867 when he suggested forming a Federal Council body while serving as Colonial Secretary of New South Wales. The states were starting to worry about issues like communication infrastructure, immigration control, unionization of workers, taxation uniformity, and defense against threats in Papua New Guinea. Most states agreed at a 1890 conference that a federal government seemed beneficial, but spent the next 10 years debating what type of governmental system to adopt before finalizing plans for a federation of Australian states.