The short answer is yes. Landlords can raise rent and with rare exceptions, there is no limit to how much the landlord can increase the rent. There are some limits on rent increases. Those are based on the contract signed.
If your rental contract is for one year, then at the end of the year lease your landlord can raise your rent. Similarly, if you rent month-to-month then at the end of the month your landlord can increase your rent every month. Some states may have rules that require advance notice of rent increases but this may only trigger if rent increases by a certain amount.