The Prime Minister vowed to "forge a more global Britain", days after slapping down Scottish First Minister Nicola Sturgeon’s demands for a independence referendum before Brexit.
She also promised "a more united nation", despite increased calls for independence in Scotland and Irish unity in Northern Ireland following last year's Brexit vote.
Speaking at the East Kilbride base of the Department for International Developmen this lunchtime, Theresa May said: "I want to make it absolutely clear that this is not in any sense the moment Britain steps back from the world. We are going to take this opportunity to forge a more global Britain…to build relationships with old friends and new allies alike."
She vowed to push for a kind Britain that would remain connected with the wider world.
Mrs May said: "The work you do here in conjunction with your colleagues says something important about Britain.
"It says we are a kind an generous country, it says we are a big country that will never let down or turn our back on those in need.
"We will always meet our commitment to the world."
Theresa May vowed to keep Britain united during a speech in Scotland today
That is why the plan for Britain I have set out has at its heart one overarching goal – to build a more united nation
She also said she would bring Britain closer together in the following vital weeks and months.
Mrs May said: "When this great union of nations, England, Scotland, Wales and Northern Ireland, sets its mind on something and works together with determination we are an unstoppable force.
“That is why the plan for Britain I have set out has at its heart one overarching goal – to build a more united nation. I believe when we work together there is no limit to what we can do.
Theresa May said Britain will continue to be a 'force for good'
"A more united nation means working actively to bring people and communities together by promoting policies which support integration and social cohesion.
"In Scotland, Wales and Northern Ireland that means fully respecting, and indeed strengthening, the devolution settlements.
"But never allowing our Union to become looser and weaker, or our people to drift apart.
She said, rather than destabilise Britain, Brexit would lead to a closer bond between England, Scotland, Wales and Northern Ireland.
The Prime Minister said: “As Britain leaves the EU and we forge a new role for ourselves in the world, the strength and stability of our union will become even more important.
"This proud shared heritage provides the bedrock of our lives in the UK.
"As we face this great national moment together I hope you will continue to play your part to build a stronger Britain, a more united Britain that I’m determined we shall be once we emerge from this period of national change.”
Theresa May's most powerful quotes Fri, March 10, 2017 Getty Images 1 of 8
'I will be ruthless in cutting out waste, streamlining structures and improving efficiency'
“This United Kingdom and its values at its heart is one of the greatest forces for good in the world today and when we work togetherr and set our hearts on a task we really are an unstoppable force.”
This is an ongoing story. Check back soon for more information.