The purpose of this research study is to determine the best treatment goals for patients with active CD. Researchers are investigating how treating and monitoring CD to meet specific treatment goals will keep your disease under control (remission) and decrease complications such as hospitalizations and surgeries. Group 1 treatment goals include IUS response (if the drug is improving your CD) and IUS assessed transmural healing (healing of all bowel layers), clinical remission (normalization of CD symptoms), and biomarker remission (improvement in stool and blood tests that show inflammation). Group 2 treatment goals include clinical remission and biomarker remission. Comparing the treatment goals in these groups may inform doctors how best to manage CD in the future. Approximately 304 people will be enrolled in this study. This research study will involve receiving 300 mg of vedolizumab as an intravenous (IV) infusion into your arm at Weeks 0, 2, 6, 10, and 14, then every 4 or 8 weeks thereafter.