Misc: what's the latin phrase meaning "in the year of our lord"?

Questions

In 1788 ---------- becomes the capitol of the United States. ?

In 1819 ---------- Wieck Schumann, German pianist, composer, born. ?

In 1819 Clara ---------- Schumann, German pianist, composer, born. ?

In 1851 ---------- Reed, who proved mosquitoes transmit yellow fever, born. ?

In 1851 Walter---------- , who proved mosquitoes transmit yellow fever, born. ?