Virtually throughout the entire world, governments put taxes on fuel to address negative externalities caused by fuel consumption. As a result, most countries have much higher gas prices than the US, where in some places, is below $2/gallon. As a result, Americans buy bigger cars because they aren't as affected by gas prices as many other car markets.
Since the Ford Ranger met it's demise in the US, there hasn't been any significant light trucks sold in America because of CAFE regulations that treat full size trucks very differently from light trucks and cars. Car manufactures don't have any incentive to make light trucks because they're effectively counted as cars when counting fleet emissions where full size trucks get a pass.