Louise,
Hopefully some of the following may be helpful.
I believe that you have the right marriage in 1897 but I wonder if Annie might not have travelled to the USA with John. I mention this because of 3 things that have caught my eye.
First - it appears that there was a child born of this marriage - a daughter who was named Mabel & whose birth (with a mother’s maiden name of Sivill) & death were both registered (in Cardiff) in the October quarter of 1897. As John & Annie married in June 1897, unless Mabel was born prematurely - which could explain her early death, it could be construed that their’s was a shotgun wedding.
Second - in Welsh Newspapers Online (on the same results page as the 1898 wedding report) there is, in the South Wales Daily News issue of 22nd November 1898, a Public Notice which states: “I, JOHN SYMONS, 51 Connaught Road, Cardiff, WILL NOT BE HELD RESPONSIBLE for any Debt incurred by my wife, Annie Symons, after this date, 19th Nov. 1898. (Signed) JOHN SYMONS Witness - H. Davies”.
Third - recorded in the 1901 census, living at no. 41 Inverness Place, Cardiff, are James & Mary Ann Sivill and their married daughter Lydia A Symonds (aged 22 & born in Illogan, Cornwall) - although she was not also with them in 1911 and I cannot find her elsewhere.
Willyam