Further with the emergence of non-state actors, it is time that the countries like the US and Britain assert their leadership role, May said in her remarks at Republican Retreat in Philadelphia.
"As we rediscover our confidence together, as you renew your nation just as we renew ours, we have the opportunity, indeed the responsibility, to renew the special relationship for this new age," May said.
"We have the opportunity to lead together again because the world is passing through a period of change. And in response to that change, we can either be passive bystanders or we can take the opportunity once more to lead and to lead together," she added.
"It did not herald the end of history. It did not lead to a new age of peace, prosperity and predictability in world affairs," she noted.
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"For some, the citizens of central and eastern Europe in particular, it brought new freedom. But across the world, ancient ethnic, religious and national rivalries that had been frozen through the decades of the cold war, returned.
"The rise of the Asian economies -- China, yes, but democratic allies like India too -- is hugely welcomed. Billions are being lifted out of poverty and new markets for our industries are opening up," May said.
"But these events, coming as they have at the same time as the financial crisis and its fallout, as well as a loss of confidence in the West following 9/11 and difficult military interventions in Iraq and Afghanistan, have led many to fear that in this century, we will experience the eclipse of the West," she said.
to lead. Because when others step up as we step back, it is bad for America, for Britain, and the world," May said.
"It is in our interests, those of Britain and America together, to stand strong together to defend our values, our interests, and the very ideas in which we believe. This cannot mean a return to the failed policies of the past," she said.
"The days of Britain and America intervening in sovereign countries in an attempt to remake the world in our own image are over. But nor can we afford to stand idly by when the threat is real and when it is in our own interests to intervene," the British Prime Minister said.