The US and UK have a long history as close allies dating back to the late 19th century, with shared common law heritage, economic investments, and diplomatic and security ties. They were allies in both World Wars and have collaborated in international organizations like NATO. However, European integration has complicated their "special relationship" and disagreements over issues like the Iraq war have made the UK more anti-American in recent decades. Maintaining strong economic ties and using the UK to represent US interests in the EU could help the relationship going forward.