What is the overall central idea of bradfords account

"The first book was written in 1630. It begins: 'And first of the occasion and inducements 'hereunto; the which, that I may truly unfold, I must begin at the very root and rise of the same. The which I shall endeavour to manifest in a plain style, with singular regard unto the simple truth in all things; at least as near as my slender judgment can attain the same.' This book focuses mainly on the journey of the pilgrims from England to North America and discusses the founding of the Plymouth settlement. It gives his opinions on the biblical importance of the pilgrims reaching America and their struggles."
-Chris Weber