Hi i am R bignner student

I already searched some packages dplyr, plyr ...but i can not hadle this data merging Plz tell me to advise

I have 50 data txt files like that

File1.txt

Chrom Position Parent1 Parent2 Sample1

1 1 A B A

1 2 A B B

1 3 A B A

1 4 A B B

File2.txt

Chrom Position Parent1 Parent2 Sample2

1 1 A B B

1 2 A B A

1 3 A B A

So i wanna mergeing

MergingFiles.txt

Chrom Position Parent1 Parent2 Sample1 Sample2

1 1 A B A B

1 2 A B B A

1 3 A B A A

1 4 A B B Na

If you have solution plz comment thank you