I believe all of the answers are correct!
But not 100% sure. Sorry.
The First Transcontinental Railroad<span> was built crossing the western half of America and it was pieced together between 1863 and 1869. It was 1,776 miles long and served for the Atlantic and Pacific coasts of the United States to be connected by rail for the first time in history.</span>
The t rex went extinct during the kt mass extinction about 65 million years ago
Answer:
Loss of Republican Party discipline, the Panic of 1819, the Supreme Court case of McCulloch v. Maryland , and the Missouri Crisis of 1820 all contributed to the decline in the political consensus—leading to the end of the “Era of Good Feelings.”
Explanation: