Essays / Canada and UN: How do you start a intro paragraph in a persuasive essay? [3]

I got a Intro paragraph and the three points. I got all the facts I want to write on about on the first and second paragraphs but I don't know how to start my first paragraph. Here is my thesis.

Canada has been activity involved with the United Nations since its creation in 1945. Since then Canadian peacekeepers have participated in almost every single peacekeeping mission. The role of Canadian peacekeeping was to bring peace and stability between warring countries. But until now Canada's role in the United Nations is slowly starting to diminish and because of that Canadian Peacekeeping has become ineffective because of its failure to prevent conflict in Yugoslavia, stop the civil war in Somalia and to interfere with the mass genocide in Rwanda.

How should I start with my first paragraph?