WASHINGTON, Aug 27 (Reuters) - US President Donald Trump renamed Lake Ontario "Lake America" on Thursday, escalating a feud with Canada that has already spawned tariffs on tens of billions of dollars in cross-border trade. US President Donald Trump on Thursday signed an executive order to rename Lake Ontario shared by the United States and Canada to "Lake America." Key points and original sources are listed below.

• WASHINGTON, Aug 27 (Reuters) - US President Donald Trump renamed Lake Ontario "Lake America" on Thursday, escalating a feud with Canada that has already spawned tariffs on tens of billions of dollars in cross-border trade.S1

• US President Donald Trump on Thursday signed an executive order to rename Lake Ontario shared by the United States and Canada to "Lake America."S2

• Canadian Prime Minister Mark Carney said the name Ontario has Indigenous roots and predates both Canada's confederation and America's Declaration of Independence.S3