With the hype around Donald Trump's maiden visit to India as US-President reaching a crescendo, here's a-trip-down the memory-lane on tours by previous American presidents. It all began about 60-years-ago when Dwight D Eisenhower became the first US-President to visit India to give a fillip to bilateral relationship which has seen many-ups and downs to finally settle down in the last few-decades as a-strategic-partnership.