Answer:
they gained California which is next to the pacific ocean we now have "from sea to shining sea".
Because of increasing sea ice.
In climate change taking place since then, there has been an opposite problem. Beginning in the late 19th century, a reduction of sea ice has been progressing in the Arctic regions. The pace of ice mass loss has been accelerating especially since the 1970s. In the first decade of the 21st century, Greenland's ice loss accelerated at a rate of 30 gigatonnes a year.
<u>SOVEREIGNITY </u>means the people are independent and have individual right and the people choose who represents them in the government.
He developed the first polio vaccine.
