Acronym Soup: TWAIN ?

Questions

In 1818 Congress decided US flag is 13 ---------- and white stripes and 20 stars.?

In 1823 Karl Wilhelm ---------- inventor (laid undersea cables), born.?

In 1841 William Henry ---------- dies of pneumonia and becomes the first U.S. president to die in office.?

In 1858 Asteroid 54, ---------- discovered (named for goddess of silence)?

In 1860 ---------- begins service, from St. Joseph, Missouri.?