That rocket, the Soviet N-1, already blew up. Back in 1972. In fact, the N-1 blew up and/or crashed four times before they finally gave up on it.
As for the "largest rocket ever built in America", that depends on how you look at it. Saturn V rocket is two feet taller without payload, SLS is one foot taller with payload, including escape tower (I suspect this was intentional).
SLS has 15% more thrust than the Saturn V (theoretically)... but the Saturn V had a lift capacity of 310,000 pounds to LEO, the SLS has only 49% of that capability 154,000 pounds to LEO ... making it significantly less efficient.
The cost of launching a Saturn V in today's dollars would be $1.25 Billion per launch (excluding payload and development costs). The SLS cost per launch is over $2 Billion per launch (also excluding payload and development costs).
NASA would have been better off going with the tried and tested Saturn V design than by reinventing a significantly less efficient wheel.