Thought to lead with that - seemed an elegant visualization: immigration shown as analogous to tree ring growth - exactly displaying quantity and direction both. (BTW: It's an example of what we are going to lose when the Republicans screw up the 2020 Census.)
Running through this I noted something interesting about my own family's immigration. All four grandparents came from Finland, But only one during the period in which the largest number of Finns immigrated to the US: 1890-1899 ( over 61,000) This was my maternal grandmother who was brought over when she was 1 yr old. My maternal grandfather didn't immigrate until the first decade of the 20th century, during which immigration from Finland dropped to ~5000. Both of the paternal grandparents immigrated in the 1880's when Finnish immigration was apparently so low it doesn't even show up on the chart.
