Are you an ECommerce entrepreneur outside the United States who sometimes depends on working with Americans?   And who isn't these days?  Perhaps your virtual remote team includes a few staffs hired over UpWork?  And have you ever been mystified by the panoply of American holidays?    Then this post is for you. Because I'm in Iowa (it doesn't get any more American than that) and have worked with people all over the globe, and I'm always running into confusion as to which holidays are significant and which…